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a
Catalytic protein mainly responsible for hydrolysis of disaccharide
b
Protein constitutively
c
Enzymes that increases permeability of the cells to β-galactosidase
d
Transferase that detoxifies the products of lactose metabolism
answer is B.
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Detailed Solution
The i gene codes for the repressor of the lac operon. The repressor of the operon is synthesised (all-the-time – constitutively) from the i gene. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.